please help with step by step explanation
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Step-by-step explanation:
Taking lhs
[(Cos a/cos b) ^2+(cos a/ sin b) ^2]cos^2b
Taking cos ^2a common and taking lcm
=Cos^2a cos^2b(sin^2b+cos^2b)/cos^2asin^2b
As sin^2b+cos^2a=1
Hence on solving we get
=cos^2b/sin^2b
=n^2
Rhs
Hence proved...
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